Every time I open up Messages, it asks me to locate iChat. This is on a new machine that I migrated from an old one on Lion and then upgraded to Mt. Lion. I don't have iChat on this machine any more, as far as I can tell. How do I stop it from prompting me? (It seems to happen only after a restart.)

Have you deleted that account from preferences if you don't want that account in use anymore? If that's too drastic, you should be able to deselect the "use this account" toggle to disable it.
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bmike♦Oct 11 '12 at 15:48

Can you please post a screenshot of the “locate iChat” dialog ?
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duci9yOct 11 '12 at 16:00

@bmike: what account? I'm using the same accounts I was using under Lion: work gmail, personal gmail, imessage, bonjour, aim.
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sprugmanOct 15 '12 at 15:30

1 Answer
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(I haven't upgraded to Mountain Lion myself, but my understanding is that Messages has subsumed iChat.) That looks like the AppleScript find-the-application-named-in-the-script dialog. Do you perhaps have something that somehow runs a script when you launch Messages? If so, find that script and edit it to refer to application "Messages" instead of application "iChat" if that works, or remove it entirely.